avr-uart
An interrupt driven UART Library for 8-bit AVR microcontrollers
Maintained by Andy Gock
https://github.com/andygock/avr-uart
Derived from original library by Peter Fleury
Interrupt UART library using the built-in UART with transmit and receive circular buffers.
An interrupt is generated when the UART has finished transmitting or receiving a byte. The interrupt handling routines use circular buffers for buffering received and transmitted data.
The UART_RXn_BUFFER_SIZE and UART_TXn_BUFFER_SIZE constants define
the size of the circular buffers in bytes. Note that these constants must be a power of 2.
You may need to adapt this constants to your target and your application by adding to your
compiler options:
-DUART_RXn_BUFFER_SIZE=nn -DUART_TXn_BUFFER_SIZE=nn
RXn and TXn refer to UART number, for UART3 with 128 byte buffers, add:
-DUART_RX3_BUFFER_SIZE=128 -DUART_TX3_BUFFER_SIZE=128
UART0 is always enabled by default, to enable the other available UARTs, add the following to your compiler options (or symbol options), for the relevant USART number:
-DUSART1_ENABLED -DUSART2_ENABLED -DUSART3_ENABLED
To enable large buffer support (over 256 bytes, up to 2^16 bytes) use:
-DUSARTn_LARGE_BUFFER
Where n = USART number.
Supports AVR devices with up to 4 hardware USARTs.